From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 555CEC3A5A2 for ; Sun, 22 Sep 2019 19:32:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2A9AB206B6 for ; Sun, 22 Sep 2019 19:32:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569180721; bh=UAqf7zew8LOkdI77XKlrpMRDlwQstc8vJo/rqe1QRCk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qTS3NilCCkVVgJmOPKCekIEN0E1hMtDkwZzv95J2BK0lBfeLGelEb2gSJFf13GKHM 7DyHujzCmq7Ch1jJ7qI5IaN67yr6ICF6EY6IH4ElfX8knpxg5AM6Lk2p5CrpmMlwHJ 0a6Dtb9rSLauzB2pTjFxfQ7wjH/UvqYcvefuGE2s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388352AbfIVTcA (ORCPT ); Sun, 22 Sep 2019 15:32:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:45564 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391696AbfIVSsi (ORCPT ); Sun, 22 Sep 2019 14:48:38 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 495C921A4A; Sun, 22 Sep 2019 18:48:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569178118; bh=UAqf7zew8LOkdI77XKlrpMRDlwQstc8vJo/rqe1QRCk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XRAPJliavka/bpxcc9YzN2CMB91MnBEy6PdGM/qxAiFXKctCkIg4khHEcSj24O8yj 2lVQof7lXuuFFDDoumHVBDgLZQDi3LAyJnhfPAuZFNFPu82StGbfZvUZJWd1uYja2I LPCu+26i7obPlJ+6r6YklYrhQg3NkQ8ad/QxX7TY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Katsuhiro Suzuki , Mark Brown , Sasha Levin Subject: [PATCH AUTOSEL 5.3 174/203] SoC: simple-card-utils: set 0Hz to sysclk when shutdown Date: Sun, 22 Sep 2019 14:43:20 -0400 Message-Id: <20190922184350.30563-174-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190922184350.30563-1-sashal@kernel.org> References: <20190922184350.30563-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Katsuhiro Suzuki [ Upstream commit 2458adb8f92ad4d07ef7ab27c5bafa1d3f4678d6 ] This patch set 0Hz to sysclk when shutdown the card. Some codecs set rate constraints that derives from sysclk. This mechanism works correctly if machine drivers give fixed frequency. But simple-audio and audio-graph card set variable clock rate if 'mclk-fs' property exists. In this case, rate constraints will go bad scenario. For example a codec accepts three limited rates (mclk / 256, mclk / 384, mclk / 512). Bad scenario as follows (mclk-fs = 256): - Initialize sysclk by correct value (Ex. 12.288MHz) - Codec set constraints of PCM rate by sysclk 48kHz (1/256), 32kHz (1/384), 24kHz (1/512) - Play 48kHz sound, it's acceptable - Sysclk is not changed - Play 32kHz sound, it's acceptable - Set sysclk to 8.192MHz (= fs * mclk-fs = 32k * 256) - Codec set constraints of PCM rate by sysclk 32kHz (1/256), 21.33kHz (1/384), 16kHz (1/512) - Play 48kHz again, but it's NOT acceptable because constraints do not allow 48kHz So codecs treat 0Hz sysclk as signal of applying no constraints to avoid this problem. Signed-off-by: Katsuhiro Suzuki Link: https://lore.kernel.org/r/20190907174501.19833-1-katsuhiro@katsuster.net Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/generic/simple-card-utils.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c index 556b1a789629d..9b794775df537 100644 --- a/sound/soc/generic/simple-card-utils.c +++ b/sound/soc/generic/simple-card-utils.c @@ -213,10 +213,17 @@ EXPORT_SYMBOL_GPL(asoc_simple_startup); void asoc_simple_shutdown(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai *codec_dai = rtd->codec_dai; + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card); struct simple_dai_props *dai_props = simple_priv_to_props(priv, rtd->num); + if (dai_props->mclk_fs) { + snd_soc_dai_set_sysclk(codec_dai, 0, 0, SND_SOC_CLOCK_IN); + snd_soc_dai_set_sysclk(cpu_dai, 0, 0, SND_SOC_CLOCK_OUT); + } + asoc_simple_clk_disable(dai_props->cpu_dai); asoc_simple_clk_disable(dai_props->codec_dai); -- 2.20.1